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Showing 1 to 6 of 6 for “"Niobia"”.
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Catalisadores de platina suportada em nióbia para oxidação seletiva de CO - SELOX
… micro (Nb2O5) and nanostructured (Nb2O5-nano) niobia in the selective oxidation reaction of CO (SELOX). X-ray diffraction, temperature programmed reduction electron microscopy and spectroscopy in the infrared region have been decisive for the presence of different sites in the platinum …
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Aerosol Synthesis and Electrochemical Analysis of Niobium Mixed-Metal Oxides for the Ethanol Oxidation Reaction in Acid and Alkaline Electrolyte
… show that synthesis and post-treatment of niobia supports can bias the utility of Pt/niobia systems towards the ethanol oxidation reaction at the anode or the oxygen reduction reaction at the cathode. Experimental and computational-theoretical analyses indicate that the mechanism of …
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Use of sol-gels in the application of ceramic oxide thin films
… nitric acid as a catalyst. In obtaining sols of niobia, tantala, and titania, increasing either the water content or the system concentration increased the rate of gelation. However, while a sufficient amount of nitric acid was required to promote the condensation of the metal oxide and inhibit …
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Atomic and Electronic Structure of Complex Metal Oxides during Electrochemical Reaction with Lithium
… derived from ReO3. The lessons learned in niobia serve as a platform to identify other compounds with related structural motifs that apparently facilitate high-rate lithium insertion and extraction. This leads to the synthesis, characterisation, and electrochemical evaluation of the even …
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Coating Thermal Noise in Gravitational-Wave Detectors
… materials development. Coating materials such as niobia-based oxides, hafnia-tantala mixtures, and substoichiometric silica, were explored employing strategies like compositional optimization, post-deposition annealing, and multimaterial designs with buried layers. Progress toward lower-noise …
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Empleo de catalizadores heterogéneos para el aprovechamiento de biomasa lignocelulósica mediante pirólisis
… lavada con ácido sulfúrico, empleando niobia. En el Capítulo 7 se presentan las conclusiones finales, determinándose que es posible densificar la cáscara de girasol, transformándola en biolíquidos, mediante pirolisis. Sin embargo es inevitable que aparezcan propiedades no deseadas. …